A Malaysia Airlines Boeing 777 disappeared from air traffic control screens over waters between Malaysia and Vietnam early Saturday morning, leaving the fates of the 239 people aboard in doubt. A look at some of the world's deadliest air disasters:
June 3, 2012: Dana Air
MD-83 jet crashes into residential area of Nigeria's largest city, Lagos, killing all 153 people aboard.

April 20, 2012: Bhoja Air Boeing 737 crashes in wheat fields near Islamabad, Pakistan while trying to land during thunder storm, killing 127 people.